set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

A magnetic needle is kept in a non-uniform magnetic field. It experiences

a) a force but not a torque

b) neither a force nor a torque

c) a torque but not a force

d) a force and a torque

Question : 2

In extrinsic semiconductors

a) the gap between conduction band and valence band is more than 16 eV

b) the gap between conduction band and valence band is near about 1 eV

c) the conduction band and valence band overlap

d) the gap between conduction band and valence band will be 100 eV and more

Question : 3

When a body is charged by induction, then the body

a) does not lose any charge

b) loses whole of the charge on it

c) becomes neutral

d) loses part of the charge on it

Question : 4

When a semiconductor is heated, its resistance

a) increases

b) remains unchanged

c) decreases

d) either (b) or (c)

Question : 5

Which of the following is the best insulator of electricity?

a) Paper

b) Graphite

c) Carbon

d) Ebonite

Question : 6

Which one of the following heater element is used in electric press?

a) Nichrome wire

b) Lead wire

c) Copper wire

d) Iron wire